Jack



FIG. 1 is a perspective view of a jack showing my new design;

FIG. 2 is the second perspective view thereof;

FIG. 3 is the third perspective view thereof;

FIG. 4 is the fourth perspective view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof.

The broken lines in the figures are for the purposes of illustratingportions of the jack, which form no part of the claimed design.

CLAIM The ornamental design for a jack, as shown and described.